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The Async Http Client (AHC) classes.
There is a newer version: 3.0.0
/*
 * Copyright (c) 2014 AsyncHttpClient Project. All rights reserved.
 *
 * This program is licensed to you under the Apache License Version 2.0,
 * and you may not use this file except in compliance with the Apache License Version 2.0.
 * You may obtain a copy of the Apache License Version 2.0 at
 *     http://www.apache.org/licenses/LICENSE-2.0.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the Apache License Version 2.0 is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the Apache License Version 2.0 for the specific language governing permissions and limitations there under.
 */
package org.asynchttpclient.netty.request.body;

import io.netty.channel.Channel;
import io.netty.channel.ChannelProgressiveFuture;
import io.netty.handler.codec.http.LastHttpContent;
import io.netty.handler.stream.ChunkedWriteHandler;
import org.asynchttpclient.AsyncHttpClientConfig;
import org.asynchttpclient.netty.NettyResponseFuture;
import org.asynchttpclient.netty.channel.ChannelManager;
import org.asynchttpclient.netty.request.WriteProgressListener;
import org.asynchttpclient.request.body.Body;
import org.asynchttpclient.request.body.RandomAccessBody;
import org.asynchttpclient.request.body.generator.BodyGenerator;
import org.asynchttpclient.request.body.generator.FeedListener;
import org.asynchttpclient.request.body.generator.FeedableBodyGenerator;
import org.asynchttpclient.request.body.generator.ReactiveStreamsBodyGenerator;

import static org.asynchttpclient.util.MiscUtils.closeSilently;

public class NettyBodyBody implements NettyBody {

  private final Body body;
  private final AsyncHttpClientConfig config;

  public NettyBodyBody(Body body, AsyncHttpClientConfig config) {
    this.body = body;
    this.config = config;
  }

  public Body getBody() {
    return body;
  }

  @Override
  public long getContentLength() {
    return body.getContentLength();
  }

  @Override
  public void write(final Channel channel, NettyResponseFuture future) {

    Object msg;
    if (body instanceof RandomAccessBody && !ChannelManager.isSslHandlerConfigured(channel.pipeline()) && !config.isDisableZeroCopy() && getContentLength() > 0) {
      msg = new BodyFileRegion((RandomAccessBody) body);

    } else {
      msg = new BodyChunkedInput(body);

      BodyGenerator bg = future.getTargetRequest().getBodyGenerator();
      if (bg instanceof FeedableBodyGenerator && !(bg instanceof ReactiveStreamsBodyGenerator)) {
        final ChunkedWriteHandler chunkedWriteHandler = channel.pipeline().get(ChunkedWriteHandler.class);
        FeedableBodyGenerator.class.cast(bg).setListener(new FeedListener() {
          @Override
          public void onContentAdded() {
            chunkedWriteHandler.resumeTransfer();
          }

          @Override
          public void onError(Throwable t) {
          }
        });
      }
    }

    channel.write(msg, channel.newProgressivePromise())
            .addListener(new WriteProgressListener(future, false, getContentLength()) {
              public void operationComplete(ChannelProgressiveFuture cf) {
                closeSilently(body);
                super.operationComplete(cf);
              }
            });
    channel.writeAndFlush(LastHttpContent.EMPTY_LAST_CONTENT, channel.voidPromise());
  }
}